Greenshot is a great free and open-source screen capture utility which allows users to annotate, highlight, apply shapes to, crop, and obfuscate screen captures. To use the program once its installed all you have to do is press the print screen key.The advantages Greenshot has over the Windows Snipping Tool are the ability to apply typed text using the annotation tool , and the shape tools can be used to create much smoother notations than those created using the pen tool in the Windows Snipping Tool and the obfuscate tool is great for hiding sensitive information in your screen shots such as account information, personal contact information, names and pictures of family and friends.

Green shot can be downloaded from the programs web site at http://getgreenshot.org/